<template>
        <el-container class="home-container">
            <!-- 头部区域 -->
            <el-header>
                <div>
                    <img src="../assets/huanbao.png" alt="">
                    <span>电商后台管理系统</span>
                </div>
                <el-button type="info" @click="logout">退出</el-button>
            </el-header>
            <!-- 页面主题区 -->
            <el-container>
                <!-- 侧边栏 -->
                <el-aside :width="isCollapse ?'64px' : '200px'">
                    <div class="toggle-button" @click="toggleCollapse">|||</div>
                    <!-- 侧边栏菜单区 
                        unique-opened是保证一次只展开一个菜单，默认为false
                        collapse是设置折叠展开效果
                        default-active是设置菜单高亮
                    -->
                    <el-menu
                        background-color="rgb(140, 179, 188)"
                        text-color="#fff"
                        active-text-color="#409FFF"
                        unique-opened
                        :collapse="isCollapse"
                        :collapse-transition="false"
                        router
                        :default-active=activePath
                        >
                        <!-- 一级菜单  index动态绑定保证值是唯一的，可以使一级菜单导航之间互不影响-->
                        <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
                            <!-- 一级菜单模板区 -->
                            <template slot="title">
                                <!-- 图标 -->
                                <i :class="iconsObj[item.id]"></i>
                                <!-- 文本 -->
                                <span>{{item.authName}}</span>
                            </template>
                            <!-- 二级菜单 -->
                            <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" 
                            :key="subItem.id" @click="saveNavState('/'+subItem.path)">
                                <template slot="title">
                                <!-- 图标 -->
                                <i class="el-icon-menu"></i>
                                <!-- 文本 -->
                                <span>{{subItem.authName}}</span>
                                </template>
                            </el-menu-item>
                        </el-submenu>
                    </el-menu>
                </el-aside>
                <!-- 右侧页面内容主体 -->
                <el-main>
                    <!-- 路由占位符 -->
                    <router-view></router-view>
                </el-main>
            </el-container>
        </el-container>
</template>

<script>
    export default {
        data(){
            return{
                // 左侧菜单数据
                menulist:[],
                iconsObj:{
                    '125':'iconfont icon-user',
                    '103':'iconfont icon-tijikongjian',
                    '101':'iconfont icon-shangpin',
                    '102':'iconfont icon-danju',
                    '145':'iconfont icon-baobiao'
                },
                // 是否折叠
                isCollapse:false,
                // 被激活的链接地址
                activePath:''
            }
        },
        created(){
            this.getMenuList(),
            this.activePath=window.sessionStorage.getItem('activePath')
        },
        methods:{
            logout(){
                // 清空token
                window.sessionStorage.clear()
                // 跳转到登录页
                this.$router.push('/login')
            },
            // 获取所有的菜单
            async getMenuList(){
                const {data:res}=await this.$http.get('menus')
                if(res.meta.status!==200) return this.$message.error(res.meta.msg)
                this.menulist=res.data 
                // console.log(this.menulist)
            },
            // 点击按钮，切换菜单的折叠与展开
            toggleCollapse(){
                this.isCollapse=!this.isCollapse
            },
            // 保存链接的激活状态
            saveNavState(activePath){
                window.sessionStorage.setItem('activePath',activePath)
                this.activePath=activePath
            }
        }
    }
</script>

<style lang="less" scoped>
    .el-header{
        background-color: rgb(118, 177, 190);
        display: flex;
        justify-content: space-between;
        padding-left: 0;
        align-items: center;
        color: #fff;
        font-size: 20px;
        >div{
            display: flex;
            align-items: center;
            span{
                margin-left: 15px;
            }
        }
    }
    .el-aside{
        background-color: rgb(140, 179, 188);
        .el-menu{
            border-right: none;
        }
    }
    .el-main{
        background-color: #eaedf1;
    }
    .home-container{
        height: 100%;
    }
    .iconfont{
        margin-right: 10px;
    }
    .toggle-button{
        background-color:rgb(80, 131, 142) ;
        font-size: 10px;
        line-height: 24px;
        color: #fff;
        text-align: center;
        // 调整字体间距
        letter-spacing: 0.2em;
        // 鼠标放上去变成小手
        cursor: pointer;
    }
</style>